ually leading to the need for revision. We had 2 questions should early revision be considered when a prosthesis had not been properly positioned? In the absence of any confirmation of infection, should a patient suspected of having a periprosthetic infection be treated as early as possible?Background The prevalence of chronically refractory wounds and ulcers is growing rapidly. However, the treatment options are not completely effective. Ozone has been demonstrated as being useful in promoting wound healing as well as adverse events in individual studies. Consequently, it is necessary to conduct a meta-analysis of high-quality trials to find out whether ozone therapy is effective and safe in these chronic wounds. Methods We will search the Cochrane Library, PubMed, the Web of Science, Embase, CBM, and the Chinese Clinical Registry website without restriction on language, date, or study setting. Randomized controlled trials of ozone therapy for chronical wounds or ulcers will be retrieved in diverse databases from inception to May 2020. The primary outcome of the meta-analysis is the proportion of participants with completely healed wounds; time to achieve complete ulcer healing; change in wound size. The secondary outcomes include the incidence of adverse events, amputation, quality of life, length of hospital stay, and cost. https://www.selleckchem.com/products/acetylcysteine.html Two reviewers will adopt the Cochrane Collaboration's risk of bias tool to assess the randomized controlled trials and all relevant data will be analyzed by utilizing the Review Manager software V5.3.0. Results This study will offer a high-quality synthesis of the effectiveness and safety of ozone for treating chronically refractory wounds and ulcers. Conclusion This systematic review and meta-analysis will find out the available evidence to assess whether ozone therapy is beneficial to wound healing and side effects, producing evidence reference for clinical practice on the treatment of wound care.Background Postoperative nausea and vomiting (PONV) is a condition that commonly following anesthesia and surgery, antiemetics can lead to some side effects in treating PONV. Acupuncture PC6(Neiguan) has been widely used in the prevention and treatment of postoperative nausea and vomiting. However, there still exists controversy towards its effectiveness, appropriate, and effective intervention time. We, therefore, design this meta-analysis to assess the effectiveness and confirm the optimal time of acupuncture PC6 point for PONV. Methods The following electronic databases will be searched from their inception to April 2020, including PubMed, Cochrane Library, EMBASE, Web of Science, WHO International Clinical Trials Registry Platform, Chinese National Knowledge Infrastructure, WanFang Database, Chinese Biomedical Literature Database, the Chongqing VIP Chinese Science, and Technology Periodical Database. All randomized controlled trials in English or Chinese involving acupuncture PC6 for patients with PONV wi766/inplasy2020.4.0012.Background This study aims to explore the impact of transcranial Doppler sonography (TDS) for detecting ischemic stroke (IS). Methods PUBMED, EMBASE, Cochrane Library, PsycINFO, Cumulative Index to Nursing and Allied Health Literature, Allied and Complementary Medicine Database, WANGFANG, Chinese Biomedical Literature Database, and China National Knowledge In-frastructure will be utilized to examine case-controlled studies that used TDS for detecting IS. All electronic databases will be searched from inception to March 20, 2020. All study selection, data extraction, and study quality assessment will be carried out by 2 independent reviewers. All study quality will be assessed by Quality Assessment of Diagnostic Accuracy Studies tool, and statistical analysis will be performed by RevMan V.5.3 software and Stata V.12.0 software. Results This study will explore the impact of TDS for detecting IS through sensitivity, specificity, positive and negative likelihood ratio, and diagnostic odds ratio. Conclusion This study expects to find out whether TDS can be utilized for IS detection.Systematic review registration INPLASY202040155.Background This study will investigate the effect of shikonin on the proliferation and apoptosis of human ovarian cancer cell SKOV3 (HOCC-SKOV3). Methods We will retrieve potential studies from inception to the March 1, 2020 in Cochrane Library, MEDLINE, EMBASE, Scopus, Cumulative Index to Nursing and Allied Health Literature, WANGFANG, and China National Knowledge In-frastructure. There are not restrictions related to the language and publication status. This study will include case-controlled studies (CCSs) or randomized controlled studies (RCSs) that examine the effect of shikonin on the proliferation and apoptosis of HOCC-SKOV3. Two researchers will independently identify literatures, extract data, and appraise study quality. Any disagreements will be resolved by discussion with another researcher. RevMan 5.3 software will be placed to perform statistical analysis. Results This study will summarize the present evidence to test the effect of shikonin on the proliferation and apoptosis of HOCC-SKOV3. Conclusion It will provide evidence to investigate the effect of shikonin on the proliferation and apoptosis of HOCC-SKOV3, and will supply reference for further study.Systematic review registration INPLASY202040146.Backgrounds We performed a meta-analysis to compare F-FDG-PET and F-FDG-PET/CT for the diagnostic performance in thyroid nodules with indeterminate cytology by Bethesda classification. Methods PubMed and Embase databases were searched for eligible studies from the earliest available date of indexing through September 2019. Only studies with clearly stated histopathology confirmation were included. Publication bias was assessed by Deeks funnel plot. The pooled sensitivity, specificity, positive likelihood ratio, negative likelihood ratio, positive predictive value, negative predictive value, and diagnostic odds ratio was determined by random-effect analysis, respectively. All diagnostic estimate indexes were determined separately for PET alone and PET/CT and were compared pair-wisely using Z-test. Results We included 214 patients from five PET alone studies and 420 patients from 8 PET/CT studies in this meta-analysis. The range of the prevalence of malignancy was 11% to 27% for PET alone studies (Median, 20%) and 4% to 50% for PET/CT studies (Median, 24%).